I think I'll go ahead and take numbers from an earnings call made to shareholders, where lying can get Blizzard in a lot of legal hot water never mind losing shareholder confidence which would be disastrous for them, over a third-party source with a somewhat shaky track record.

Don't really feel that warcraftrealms is really a good indicator. I mean there are literally entire guilds missing on my server looking over it. Am I absolutely certain though that the amount of "active" accounts has nothing to do with how many players are actually still playing this game? Definitely.